Nearly a year after its test launch, Wal-Mart Stores WMT +0.01% recently revamped its ShippingPass delivery subscription program, rolling back the price of a yearly membership by $1 – to $49/year – and speeding up the delivery time frame from three days to two. At the time of these changes, mid-May, the program appeared to be invitation-only, allowing interested shoppers to sign up for a wait list for membership. As of late June, while ShippingPass is still termed a “pilot” program, Walmart – per its website – has opened up subscriptions to “everyone, no invitation required.” With Walmart now offering comparable shipping speed at half the price of Amazon’s popular Prime membership, has consumer interest ignited for ShippingPass?